Title

The Role Of Triplet States In The Emission Mechanism Of Polymer Light-Emitting Diodes

Abstract

The blue emission of polyfluorene (PF)-based light-emitting diodes (LEDs) is known to degrade due to a low-energy green emission, which hitherto has been attributed to oxidative defects. By studying the electroluminescence (EL) from ethyl-hexyl substituted PF LEDs in the presence of oxygen and in an inert atmosphere, and by using trace quantities of paramagnetic impurities (PM) in the polymer, we show that the triplet states play a major role in the low-energy emission mechanism. Our time-dependent many-body studies show a large cross-section for the triplet formation in the EL process in the presence of PM, primarily due to electron-hole recombination processes. © 2009 Europhysics Letters Association.

Publication Date

10-27-2009

Publication Title

EPL

Volume

87

Issue

5

Number of Pages

-

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1209/0295-5075/87/57008

Socpus ID

79051469980 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/79051469980

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